Daniel w



D. W. McNElL.

PROCESS OF Momma CERAMICS.

APPLICATION FILED MAR. 19. 1917- THEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA c.

DANIEL W. MCNEIL, OF CINCINNATI, OHIO, ASSIGNOR TO THE JOHN DOUGLASCOMPANY, OF CINCINNATI, OHIO, A CORPORATION OFOHIO.

PROCESS OF MOLDING CERAMIOS.

Application'filed March'lt), 1917.

To all whom it may concern Be it known that I, DANIEL WV. MCNEIL, acitizen of the United States of America, and resident of Cincinnatninthe county of Hamilton and State of Ohio, have invented a new and usefulImprovement in'Processes of Molding Ceramics, of which the followingis-a specification.

An object of my invention is a process of molding ceramics such aslavatorieshaving interior indirect passages, in such a manner that therewill be no burs of ceramic material left projecting within the passagesto catch dirt and grease.

A further object is a process of molding ceramics having interiorindirect passages, in such a manner that the walls of the passages andthose of the ceramic are molded simultaneously and integrally.

These and other objects are attained in the process described in thefollowing specification and illustrated in the accompanying drawings, inwhich;

Figure 1 is a transverse sectional elevation of a lavatory molded inaccordance with my improved process, showing the last step in themolding operation.

Fig. 2 is a fragmental sectional view taken on the line 2-2 of Fig. 1,upon an enlarged scale.

Fig. 3 is a fragmental sectional view taken in the same relativeposition as Fig. 2, but

of a lavatory molded in accordance with the usual process.

In the molding of ceramics such as lavatories, by means of processesheretofore employed, the indirect passages formed therein, are molded byattaching to the wall of the ceramic, after it has been molded, aseparately molded piece which is caused to adhere to the walls of theceramic by separate and particularly adhesive coatings of clay spreadupon the surface to be brought into contact with one another. In Fig. 3this process is illustrated, clay coatings 4, commonly known as slips,being laid between the wall 5 of the lavatory and the piece 6 which isto be attached thereto. After the attached piece 6 and the wall 5 havebeen fired, the slips 4: result in the formation of substantially onepiece of fired clay. However the objection to this method is that inpressing piece 6 against wall 5 the ends of the interposed slips 4 bulgebeyond the edges of piece 6 and result in the formation of inaccessibleSpecification of Letters Patent.

Patented July 29, 1919.

Serial No. 155,715;

burs 7 on the interior of the passagethus creating obstructions therein.This is objectionable in that such obstructions result in theaccumulation of dirt and grease in the passage. An additionaldisadvantage of thismethod of construction is that the joint between thepieces 5 and-6 is notas strongv as it would be were the pieces formedintegrally.

In, my improved process I locate a core of: the shape of the internalpassage, in the clay, while it is being assembled to the form of theobject, and before pressure is brought upon the clay to compact it. Ithen compact the clay in the usual manner and after the pressure isreleased I remove the core, trim, dry, glaze and bake the object.

In the process of molding the lavatory illustrated in the accompanyingdrawings, the clay is first placed in the mold provided for forming thelavatory, suflicient being lo cated at the back of the bowl portionthereof to support a core 8 of the shape of the overflow passage 9 to bemolded therein. After the core has been located in position additionalclay is packed around it so as to embed it completely. Thus the backwall 10 of the passage 9 is formed before the core 8 is placed inposition and the front wall 11 is formed after the core is placed inposition. With core 8 thus located and the other portions of thelavatory molded to their embryonic formation, the entire lavatory issubjected to pressure in the suitably constructed mold. After the clayhas been pressed, the core is removed by trimming around the edges ofthe clay at the ends of the passage in which the core is located, andthen slipping the core therefrom. In the construction disclosed in Fig.1, the core is curved and tapers from its upper to its lower end topresent a horn-like appearance. Thus it is removed from the passage veryeasily, it being loosened immediately upon the slightest movementthereof from its molded position. The axis of the core and that of thepassage, lie in the arc of a circle so that the removal of the core fromthe passage will be easy and prevent the breakage of the molded clayaround it. V By molding the passage, a section of which is illustratedin Fig. 2, in this manner, the material of the bowl and the passagepresent no line of demarcation which might lead to fractures betweenthem or of the formation of burs having indirect passages may beemployed in the molding of other articles than that disclosed in thedrawings and which have passages the shape of Which facilitates theremoval of the cores employed for molding them.

Having thus described my invention, What I claim is:

1. A method of molding ceramics having interior indirect passages,consisting in assembling the clay into embryonic form of the object tobe molded, embedding loosely therein a core having regularly curvedoutlines, molding the clay around the core and to the shape ofthearticle to be molded, re- 20 moving the core, and firing the moldedclay. w

of the object to be molded, embedding loosely therein a core havingregularly curved and tapered outlines, molding the' clay around the coreand to the shape of the article to be molded, removing the core, andfiring the molded clay.

In testimony whereof I have hereunto subscri lped my name this 15th dayof March, 191

Witnesses:

WALTER F. MURRAY, W. THORTON BOGERT.

Copies of this patent may be obtained for fiveacents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

DANIEL W. MoNEIL. a

